Vertical boring-mill.



M. SILBERMAN.

VERTICAL BORING MILL.

APPLICATION FILED NOV. 16, 1911.

Patented July 30, 1912.

3 SHEETS-SHEET 1.

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M. SILBERMAN.

VERTICAL BORING MILL. APPLICATION rum) NOV. 16, 1911.

Patented July 30, 1912.

3 SHEETSSHEET 2.

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VERTICAL BORING MILL. APPLICATION FILE-D NOV.16, 1911. 1,()34,] 50, Patented July 30,1912.

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UNITED STATES PATENT oFFIoE.

MORRIS SILBERMAN, OI CLEYELAND,OHIO.

VERTICAL BORING-MILL.

Specification of Letters Patent.

I Application filed November 16, 1911. Serial No. 660,637.

To all whom it may concern. 7

Be it known; that I, MORRIS SILBERMAN,

a subject of the Emperor of Russia, residing,

at Cleveland, in the county of Cuyahoga and State of .Ohio, have invented 'certam new and useful Improvements in Vertical Boring-Mills, of which the following is a specificatiom This invention relates to metal working machines, and particularly to the type of machines known as vertical boring mills.

rings from a cylindrical stock, and is illustrated in connection with work of that kind. Means for the operation of four cutters are shown, one external cutter or trimmer, one internal tool, a raobeting or groovin tool,

and a cutting off tool- More or less of these tools may be used as desired or necessary according to the work at hand.

In the accompanying drawings-Figure l is a front elevation of the machine. Fig. 2 is a section on the line 2-2 of Fig. 1, looking down. Fig. 3 is a detail in end elevation of a vertically traveling rail and associated parts. Fig. 4 is a top view of the parts shown in Fig. 3. Fig. 5 is a vertical section on the line 55 of Fig. 1. Fig. 6 is an end view-of parts shown in Fig. 5. Fig. 7 is a sectional view of the ejector. Fig. 8 is a detail in section .of a clutch at each end of the machine. Fig. 9 is a detail in section of the valve for controlling the air supply to the ejector. Fig. 10.is a detail in section of a clutch shifter'which controls the up and down movement of the rail and one of the tool carriages. Fig. 11 is a sec- 34 and the clutch member.

chine, .6 indicating a cone pulley to which power will be applied. This drives its shaft 7 and gear 8. which meshes with gear 9 loose on shaft 11 which-also carrles a gear 12 fast thereon. For dir'ectorive the gears 9 Patented July so; 1912.

and 12 may be locked together by known devices which include a sliding pin 13. To lessen the speed a back gear is provided including gears 10 and 16, eccentric shaft 15, and'handle 14 by shift of which the back gear may be thrown in mesh with gear 12. i

this arrangement being old and well known. The shaft 11 extends forwardly and at its front end has a bevel pinion 17' meshing with ring, gear 19 on the underside of the rotary table 18 which turns. on the base A.

The stock 20 rests on the table and is heldby a universal or other clutch 21.

The gear 12 is in mesh with a gear 22 on the rear end' of a shaft 22* which through bevel gears 23 and 24 drives a horizontal cross shaft 25 which extends through the bed of the machine and which operates the verticalshafts42 at opposite ends of the ma chine, by means of which shafts 42' most of the operation of the cutters'is effected.

At each end of the shaft25 is a bevel gear 26 meshing with'a similar gear 27 on vertical shaft 28' which is part of a known change speed and stop gearing which includes a shaft 34, and gears on each shaft, the gears being paired for different speeds, and all controlled by a pin 32 which may be shifted to engage any pair of gears. This change speed gear is known and, it is thought, requires no further description.

Between the upper end of the shaft 34 and each shaft 42 is a clutch comprising a lower member 40 and an upper member 41, and a collar 47 pinned to the shaft 34 under the member 40.

. 48 is a keyway in shaft 34 and 50 is a keyway in shaft 42. The member 40 has a key 46 which slides in said keyway 48, and also a shoulder 44 projecting outwardly.

' 45 is a spiral spring between the member 40 and the collar 47.

The upper member 41 is keyed to the shaft 42. The 'collar 47 tests on the casing of the change speed gear and so supports the shaft The spring 45 normally holds the clutch members in.en- I gagement.

43 is an arm attached to the cutter car riage Z, and when said carriage descends zontal tool slide Z as shown, in Fig. 8, and disengages the clutch to stop the shaft 42. A similar action takes place at the right side of the machine with respect to the cutter carriage X to which a similar arm 43 is attached.

Referringnow to the cutter carriage Z, at the left of the machine, the means for operating the same and the cutter carried thereby will be explained.

On the shaft 42 is a bevel gear 49 whichslides up and down with the carriage, and has a key traveling in the keyway 50. This gear meshes with another gear 51 on horizontal shaft 52 at the front end of which is a bevel gear 53 which drives two gears 54 and 54 in opposite directions. run free on a shaft 58 and each has a clutch member engageable by member 55 on said shaft 58. member is operated by a lever 56 pivoted on a bracket 57 attached to the carriage, and the member 55 has a key sliding in a keyway in the shaft. By shifting the handle 56 either way, one or the other of the gears 54, 54* is caused todrive the shaft 58, the direction of rotation being according to'the gear engaged. The shaft 58 has thereon a Worm 59 which meshes with a worm gear 61 suitably held in place on the carriage, and this gear is threaded internally and has a nut to travel on the vertical screw 62. Sincethe worm gear cannot travel with respect to the carriage, it runs up and down on the screw and raises or lowers the carriage according to the direction of. rotation. The-screw 62 is fixed. The carriage The shifting in a suitable guideway therein, and this slide is operated by a screw 65 which turns in a nut 66 on the carriage. The tool holder 67 is pivoted at 68 on the inner end of the slide, the tool being indi cated at a, engaging the exterior of the work 20. The holder may betightened by a handle 69, shown only in Fig. 2. The adjusting screw 65 is operated by hand, being squared to receive a handle, so that the tool may be set in proper position with respect to the work.

It will be obvious from the above description that when the shaft 42 at the left is turned, and the clutch 55 is thrown in, the tool carriage will be raised or lowered according to the feed desired, the tool an acting on the outside of the work, as the latter is rotated.

Referring now to the right hand end of the machine, the clutch and change speed gear at the lower end of the shaft 42 is similar to that above described. Said shaft 42 has a bevel car 69? thereon (Fig.6), with a key that slides up and down in the key way in the shaft. This gear drives the gear .70 the shaft of which carries, at its front end, a gear 71 located between two gears 72 loose on the shaft 73. Between the two gears 72 These gears.

a shifting clutch Z carries the horiis a clutch 55, similar to the clutch 55 at the left. The clutch 55 is o erated by an upright shifting lever 74 pivoted at 75 (Fig. 6). On the inner side of the lever v74 is a boss 99 ground to a wedge shaped point. When the lever 74 is vertical the clutch is in neutral position. This shifter is operated automatically, by the movement of the cutter slide Z and since the movement is slow, it is necessary that the lever be thrown beyond the neutral point. Therefore the wedge shaped projection 99 wipes over the wedge shaped end of a spring pin 100 set in a recess in the carriage. The wedges are ground to a knife edge so that one must slip over the other when they reach the neutral point. The slide Z carries two stops 82 adjustable on a scale 81, and arranged to strike the lever 74 and disengage the clutch. As the lever is turned by the stops the projection 99 wipes over the pin 100, and on reaching the neutral point slips over the edge of said pin and the force of the spring behind said pin, in connection with the wedge action, completes the throw of the lever, thereby carrying the clutch 55 to the opposite gear 72 and reversing the motion of the slide. Said gears 72 carry clutch members as will be understood.

As above explained, the shaft 73 is driven in one direction or the other by the gears 72 according to the throw of the clutch which reverses automatically as above explained; On the outer end of shaft 73 is a gear 76 which drives gear 77, through an intermediate gear. Gear 7 7 is loose on shaft 78, but may be made to drive the same by throwing in a clutch 79 which may be shifted in any suitable way. The shaft 78 is threaded and engages a nut on the slide Z to advance or retract the same. The bearing 80 supports the outer end of the shaft to prevent Wabbling or breakage thereof which might occur when the slide is fed far in. The slide has a tool holder 67 which carries a cutting off tool I; which, when advanced, will cut off a ring at the top of the stock.

The-slide, Z is carried up and down by the carriage and the means for raising and lowering said carriage will now be described.

On the upper part of the slide Z is a block 83 on top of which is a sliding block 84 adjustable by a screw 85 (Fig. 10). The block 84 has an incline at one end, as shown, and may be adjusted according to the scale86 on the carriage X. Referring now to Figs. 5 and 6, 1 is a bevel gear driven by the shaft 42 and slidable up and down thereon, by means of a key in the keyway. This gear 1 drives gears 2 3 and 4', as clearly shown in Fig. 6. Gear 4 is fast on a shaft 5' which is integral with the worm 94, which is thereby driven by the shaft 42. Worm 94 meshes with a worm gear 93'integral with a sleeve 94' which turns in a recess in the carriage X, and around a vertical screw shaft 92 which extends from the top tothe'bottom of the machine. The sleeve 94' works around the screw but is not threaded. Nuts 95 hold the sleeve-in position on the carriage. At the upper end of the sleeve 94' is an integral clutch member 91 which is engageable by a shifting clutch member 90 which has a key indicated at 90' working in a keyway 92 in the screw shaft. When the member 90 is driven by the member 91 the screw shaft will be turned. 87 is a shifting lever with a yoke engaging the clutch member 90, the lever being pivotedat 89. At the lower end of the lever 87 is a roller 88 which rests on the block 84, with a spring 88 ressing the roller against the block and tending to shift the lever to disengage the clutch member 90.

6 is a gear integral with a sleeve 7 which turns in a supporting bearing inthe carriage X and whichis internally threaded to i run on the screw 92. The gear 6' meshes with a gear 8 on the inner end of a shaft 9' which shaft extends through a clutch member 12 integral with the carriage X.

11 is a clutch member shiftable on the shaft 9' and having an internal key 11 engaging in a keyway 10 in the shaft 9.

13' is a hand wheel by which the shaft 9 and sleeve nut 7 may be turned by hand when desired.

When the screw 92 is turned the sleeve nut 7 will also turn, thereby rotating the shaft 9 by means of the gears 6:, and 8'.

When the clutch member 11 is shifted in to one thirty-second of an inch. The screw 85- is then turned until the high point of the incline of the block 84 is at zero on the scale, which determines the point atwhich the cutter carriage will be lowered, that is, when the tool is out of the work. Assuming that the block 84 is set as stated, it will be understood from the above description that the time during which the carriage will move down is controlled by the position of the stops 82 which shift the clutch. Assuming that the slide Z is receding, the roller 88 is at the proper. time picked up by the incline of the block 84, and when it reaches the top of the incline the number 87 throws the clutch member 90- into engagement with the clutch member 91, which is being constantly driven as above explained. When the clutch is so thrown in the screw 92 is turned by means of the key 90 in the slot 92', and as the screw turns it will lower the carriage byreason of the action of the sleeve 7 as above explained. Therefore at each withdrawal of the slide Z the carriage X is lowered, and continues to lower until the lever 74 is shifted by the stops, which reverses the motion through the gear 76 and advances the slide until the wheel 88 runs off the inclined end of the block 84, allowing the front end of the lever 87 to drop and In 'duetime the advance of l X will again be lowered; and the operation will continue until the stock is used up and the clutch members40 are disengaged by the arms 43 as above described.

The cross rail Y slides vertically on guides B, and this rail carries cutting tool holders to behereinafter described. Itis necessary Y to the automatic operation of the machine that the rail Y move up and down according to the corresponding movement of the cutter carriage X.', To effect this movement the'screw 92 has at the upper end a bevel gear 14 which meshes with gear 15 on shaft- 16 which extends across the top of the machine and carries a gear 18 meshing with gear 17 on a vertical screw 19' which is a counterpart of the screw 92. When the screw 92 turns the screw 19' is driven accordingly. These screws pass through the internal threaded sleeves 20 which are mounted to turn but not to travel on the rail Y, and the rail is thereby lifted or lowered when the screws are turned.

For quick operation of the rail Y and carriage X, the shaft 16' has a pair of opposite gears 21 loose thereon, and either of which may be engaged by a clutch 55 keyed 'tothe shaft but slidable to engage either gear. The gears are driven in opposite directions by a gear 22 on a short shaft which has a pulley behind the gear 22 belted by belt K to a pulley 23 on the rear end of the shaft 11 (see Fig. 2). WVhen it is desired to rapidly raise or lower the rail Y and carriage X the clutch 55' may be thrown in engagement with one of the gears 22' and, the clutch 90 beingdisengaged, the

shaft'l6 will be driven directlyv from the main shaft 11, thereby turning the screws 92 and 19 to raise or lower the rail Y and carriage X. This arrangement is particularly useful in lifting the rail and carriage after one complete operation, before a new piece of stock is. put on'the bed. The. rail is partly counterbalanced by weights attached to the cables 24'- and 25' which pass over suitable guide rollers 26' and 27 and 28' and 29 and 30 respectively.

The rail Yearries two tool slidesW and Z, the cutter w, carried b the former, operating on the inner side 0 the cylindrical stock and the cutter 2, carried by the latter, acting to form a rabbet in the topflof the work, as in making a ring 'L shaped in cross section. The means for operating these slides will now be explained, premising, that they slide verticallyin suitable carriages L and M which are movable laterally or horizontally on the rail.

Referring particularly .to Figs. 1, 3 and 4, 32 is a worm which is driven .by the shaft 42 at the right, the worm being keyed to the shaft and slidable up and down thereon. This Worm drives a gear 31 fast on a shaft 33? which carries a' bevel gear 34' meshing with two bevel gears 35 and 36 turning loosely on a shaft 49. There is a clutch 55 keyed on the shaft between these two gears and shiftable to engage either by means of a lever 37 pivoted to a small bracket on the rail Y. The end of the lever 37 projects into a cam slot in the roller 38', which acts to reverse the clutchat suitable intervals.- Integral with the gear 36' is a spur gear 40 which through an intermediate gear 60 drives a gear 39' fast on the shaft 46' which carries the cam roller 38'. As the roller turns the shifter 37' is thrown one way or the other to reverse the motion. .The shaft 49' carries a gear 47 fast thereon which through an .in-

v termediate gear 48 drives a gear 43 which is fast on the shaft 41, and also, if desired, drives a gear 44 and screw shaft 42' on which said gear is mounted. The shaft 41 extends from end to end of the rail Y and carries a worm 80' with a key working in a keyway 82 in said shaft, and said worm meshes with a worm gear 83 on the rear end of a shaft which is mounted in the carriage M, and which has at its front end a pinion 61 meshing with a rack in the edge of the slide Z Evidently as the shaft 41 is turned, it will raise or lower the slide Z and the cutter 2 carried thereby. Similar mechanism is provided between the shaft 41 and the slide W, to feed the latter. The shaft 41 is made in two sections, with a clutch 65 between, so that by shifting the clutch in or out both or one of the slides W and Z may be operated according to the work desired. The mechanism for driving the left hand section of the shaft 41' is the same as that above described for driving the right hand section, except that the cam wheel-38 is omitted, and the clutch will be thrown by hand. The said cam wheel may be used to control both slides by throwing in the clutch 65' and slipping the gear 43 at the left out of engagement with the gear 44'. Then the whole shaft 41' will run as one, and will be reversed by the operation of the cam wheel 38.

The two shaft sections 42 are threaded to engage the carriages L and M respectively, either for adjustment by hand cranks ap plied to said shafts, or for giving the carriages a lateral motion. When lateral motion in addition to vertical motion is desired the gears 44 will be used, but when only vertical motion is desired the gears 44 will be slipped out of engagement with the intermediate gears 48 and consequently the screw shafts 42' will remain idle.

As above explained the gear 76 controls the horizontal motion of the slide Z. The gear 39' controls the vertical motion of the slides Z and W. These motions must be coordinated according to the particular work being done, and so the gears 76 and 39' may be changed to vary the respective motions. The size of the gear 39 is necessarily such that the cam wheel 38 will make just one turn to finish a single article, such as a ring or other piece of work, since said cam wheel controls the up and down movement of the slides or holds the same at a stand still by shifting the clutch 55 to a neutral position during particular stages of the cuttlng.

It is designed that the machine shall be wholly automatic, and for this purpose it is necessary to eject the ring or other piece of work which is cut from the stock, at the end of each operation. To this end I provide an ejector operated. by compressed air. This ejector includes a cylinder 7 6 which is sus-' pended from a bracket fastened to the rail Y, by means of hangers 71 and 73', adjustable by slots 77 and bolts 74 and straps with thumb screws 72, so that the cylinder may be adjusted up and down or back and forth with respect to the bracket 70. Screws and a turnbuckle 75 assist in rigidly supporting the cylinder. The cylinder has an air inlet through the hose 83 and contains a piston head 87 and rod and a spring 79 tending to force the piston backwardly. The piston rod slides through a bushing 82' with a key working in a keyway in the piston rod to prevent turn of the latter, and at the front end the piston rod carries asmall bent piece of metal 81 that engages in the slot cut by the tool I), the cylinder being positioned properly for that effect. When air is admitted into the cylinder the piston is advanced and the rod forces the ring or other piece of work forwardly until' it falls off the remaining stock, in front of the rotary bed. The distance the piston advances the finished piece need only be far enough to cause the front side of the ring to overbalance and fall forwardly. The ejector is operated at proper intervals by means of a block or projection 89' (see Figs. 5 and 9) the valve 88' which turns in a valve casing 90. The valve is a three way valve with a supply passage 84' through which compressed air is supplied from any-suitable source, a pipe connection 83 to the cylinder, and anexhaust 85. A spring 86 tends to close the valve connection bet-ween the sup ply pipe 84 and the cylinder pipe 83'. When the slide Z backs out far enough to clear the tool I) from the work, at the end of' the operation, the block 89"strikes the lever 87 and throws the valve to admit air to the cylinder, and the piston advances-and ejects the work. At the. beginning of the next operation, when the slide Z advances toward the work the spring 86 turns the valve to connect the cylinder with the eX-' haust 85, and the spring 7 9 then returns the piston to original position.

It is thought that the operation of the machine will be understood from the above description, but it may be recapitulated as follows: The stock from which the rings or other articles are to be cut is clamped to the rotary bed 18 which is driven by the means described. The left hand carriage and tool slide are set up for the outside diameter which is cut by the cutter a. The carriage L and slide W are set up for the inside diameter, cut by the tool to. The carriage X and tool slide Z are then set up to proper position, and reversing stops 82 set to proper position for the reverse. Next the block 84 is set to control the downward movement of the carriage and effect the same at the proper time. The carriage M and slideZ are then set to properly position the cutter a which acts perpendicularly on the edge of the stock. These various operations may be performedby cranks applied to the shafts 41, 42', 65 and 78. The vertical drive shafts 42 are then started by throwing in the change speed and stop gears at the lower ends thereof. The rotation of the shaft 42 at the left causes the tool a to cut the outside diameter, the tool being fed down as the work rot-ates. The rotation of the shaft 41' at the right advances the slide Z and puts the cutting off tool I; in action. Also, said shaft through the intermediate mechanism described operates the slides W and Z and I enables the tools 20 and z, carried thereby to act on the work. When the slide Z as advanced the tool 5 through the work and a ring is out off the stop 82 reverses the clutch 55 and the slide Z is withdrawn, and when the tool is cleared from the work the roller 88 rides up the incline of the block 84 and throws in the clutch 90. This causes the screw 92 to turn thereby lowering the carriage X for the next operation,'the finished piece of work having been meanwhile ejected by the ejector 81. The turning of the screw 92 operates the screw 19 and these two screws lower the rail Y to the same extent as the carriage X, thereby bringing the vertical tools in proper position for their subsequent action on the stock, said action being controlled, as above explained, by the cam wheel 38 which controls the rise and fall of the slides W and Z. Since the tool a carried by the carriage Z cuts only on the-- outside, it simply feeds down, and in the progress of the work this carriage, and the carriage X, descend untilthe arms 43 strike the flanges 44, opening-the clutches 40, and thereby stopping both shafts 42, to permit the removal of the remaining part of the stock 20 and the substitution of a new casting. Necessarily before this is done the carriages and rail must be lifted which may conveniently-be done by the quick acting gear driven by belt K at the back of the machine.

I claimr 1. In a metal working machine, the combination of a rotary work holding table, upright guides beside the same, a lateral tool carrier slidable on one of said guides, a cross rail slidable up and down on said guides, a tool carrier mounted on the cross rail, screws operatively connected to the cross rail and the lateral tool carrier, and means controlled by the position of the tool carried by said lateral carrier to automatically actuate the screws, to effect simultaneous vertical movement of the rail and lateral tool carrier.

2. In a metal working machine, the combination of a movable work holding table, upright guides beside the same, a lateral tool carrier slidable on one of said guides, a cross rail slidable up and down on said guides, a tool carrier mounted on the cross rail, screws operatively connected to the cross rail and the lateral tool carrier, and means controlled by the position of the tool carried by said lateral carrier to automatically actuate the screws, to effect simultaneous vertical movement of the rail and lateral tool carrier.

3. In a metal working machine, the combination of a rotary work holding table, a pair of vertical guides beside the same, a carrier slidable vertically on one of 'said guides, a tool holder slidable laterally on said carrier to advance or retract a tool from the work, a vertically slidable rail- 4. The combination of a movable work holding table, upright guides beside the same, a carrier mounted for vertical movement on one of said guides, a horizontally movable tool slide on the carrier, a rail mounted for vertical movement on the guides, a screw, operative connections between the screw and the carrier and rail, adapted to raise or lower said rail and-carrier by rotation of the screw, a vertically movable tool slide on the rail, driving devices operatively connected to both slides, said devices including reversing means to advance and retract the slides, and means controlled by the movement of vone of said slides, to operate the screw when the tools are retracted from the work.

5. In a metal working machine, the combination of a movable work holding table,

an upright guide beside the same, a carrier slidable vertically on said guide, a rail slidable vertically on said guide and extending across the table, a tool holding slide mounted for horizontal movement on the carrier, a tool holding slide mounted for vertical movement on the rail, means to raise and lower the carrier and rail, a vertical shaft, and transmitting devices between the shaft and the slides respectively, each of said transmitting devices. including reversing mechanism adapted to automatically advance and retract the slides.

6. In a metal working machine, the combination of a rotary work-holding table, upright-guides beside the same, a tool carrier mounted on each of said guides and adapted for operation laterally with respect to the work, a rail sli glableup and down on the guides an extending across and above the table, a tool carrier mounted upon the rail and adapted for operation vertically with respect to the work, a power shaft, and operating connections between said shaft and the lateral carriers and the rail, adapted to eflect simultaneous movement of said carriers and the rail.

7. In a metal working machine, the combination of a movable work holding table, guides beside the same, a vertically movable carrier on one of said guides, a tool slide mounted on said carrier, a rail slidable up and down on the guides, a tool slide mounted on the rail, a drive shaft, operating connections between the shaft and the slides respectively, including reversing devices to advance and retract said slides, and means driven by said shaft to effect vertical movement of the carrier and rail.

'8. In a metal working machine, the combination of a movable work holding table, guides beside the same, a vertically movable carrier-on one of said guides, a tool slide mounted on said carrier, a rail slidable up and down on the guides, a tool slide mounted on the rail, a drive shaft, operating connections between the shaft and the slides respectively, including reversing devices to advance and retract said slides, and means driven by said shaft to effect vertical movement of the carrier and rail.

9. In a metal working machine, the combination of a movable work holding table;

guides at opposite sides of said table, a tool holding carrier on each guide, a rail mounted on the guides and extending across above the table, a tool carrier on the rail, an operating shaft beside each guide, operating connections between each shaft and the tool carrier on the adjacent guide, adapted to raise or lower said carriers, and operating connections between one of said shafts and the rail, adapted to raise or lower the latter with the carrier mounted thereon.

10. In a metal working machine, the combination of a work holder, a guide adjacent the same, a tool carrier slidable on the guide and having a projection, a shaft geared to the tool carrier to move the same on the slide, and a clutch on the shaft having a member located in the path of the pro ection and arranged to be struck thereby to open the clutch at the limit of movement of the carrier in one direction.

11. In a metal working machine, the combination of a rotary work holding table, a

guide extending beside the same and parallel to the axis thereof, a tool carrier slidable on said guide, a shaft parallel to the guide, gearing between the shaft and the carrier adapted to move the same along the guide, a power shaft, gearing between the table and the power shaft, to rotate the former, and gearing between the power shaft and the first mentioned shaft, said gearing including a clutch having a member projecting in position to be struck by the carrier to open the clutch at the limit of movement of the carrier in one'direction.

12. In a metal working machine, the comguide beside the same, a carrier slidable on said guide, a tool holding slide mounted on the carrier for movement toward and from the work, a drive shaft, gearing between said shaft and the slide. adapted to advance and retract the same, said gearing including reversing devices, and means carried by the slide to operate the reversing devices.

13. In a metal working machine, the combination of a rotary work holding table, a guide beside the same and parallel to the axis thereof, a carrier slidable on the guide in a direction parallel to said axis, a tool holding slide mounted on the carrier for movement in a direction transverse to said axis and toward and from the work, a drive shaft extending parallel to the guide, automatically operated reversing gearing between the shaft and the slide to advance and retract the latter, and means to automatically advance the carrier -along the guide at each retraction of the slide.

14. In a metal working machine, the combination of a rotary work holding table, a guide beside the same and parallel to the axis thereof, a carrier slidable on the guide in a direc'rion parallel to said axis, a tool -holding slide mounted on the carrier for movement in a direction transverse to said axis and toward and from the work, a drive shaft extending parallel to the guide, automatically operated reversing gearing between the shaft and the slide to advance and retract the latter, and means operated by said shaft to automatically advance the carrier along the guide at each'retraction of the slide.

15. In a metal working machine, the combination of a work holding table, a support adjacent thereto, a tool carrying slide mounted on said support for movement toward and from the table, a drive shaft, reversing gearing between the shaft and the slide to operate the latter, said gearing including a clutch, a shifter for the clutch, and a cam wheel engaging the shifter and adapted to throw the clutch to reverse the movement.

16. In a metal workin machine, the combination of a work holdlng table, a cross rail-supported above the same, a tool carrying slide mounted on said rail, a shaft e tending along the rail and geared to sald slide, a drive shaft, and reversing gearing between the drive shaft and the first mentioned shaft, said gearing including a clutch, a shifter'for the'clutch, and a cam wheel engagingthe shifter.

17. In a metal working machine, the combination of a movable work holding table, a guide beside the same, a rail slidable on the guide, a tool holder mounted on the railfor movement toward and from the work, a

drive shaft, means to intermittently advance the rail toward the work, and reversing gearing between the shaft and the tool holder adapted to advance and retract the latter, said reversing gearing including a cam wheel shaped to advance and retract" the tool holder during the intermission in the movement of the rail.

18. In a metal working machine, the combination of a movable work holding table, a guide beside the same, a cross rail mounted on said guide for movement toward and from the work, a tool holding slide mounted on the rail for movement toward and from the work, a drive shaft, means driven by said shaft to advance and retract the slide with an intermission after each retraction, and means operated by said shaft to automaticallj advance the rail toward the work durin such intermission.

19. a metal working machine, the combination of a work holding table, a ide beside the same, a drive shaft exten 1n arallel to the guide, a carrier slidable n the guide beside the table, a rail slidable on the guide above the table, a tool holding slide mounted for movement on the carrler toward and from the work, another tool holdlngslide mounted for movement on the rail toward and from the work, automatic reverslngi gearing between each slide and said shaft, to advance and retract the slides Fespectively, a feed screw operatively engaging both the carrier and the rail, driving devices between the shaft and the screw, said devices including a clutch, and means automatically operated by one of the slides, to close the. clutch and operate the screw and advance the carrier and rail while the slides are in retracted position.

20. In a metal working machine, the combination of a movable work holding table, a guide beside the same, a drive shaft extending parallel to the guide, a carrier slidable on the guide beside the table, a rail slidable on the guide above the table,

slide mounted for movement on the carrier a tool holding rail toward and from the work, automatic reversing gearing between each slide and said shaft, to advance and retract the slides a respectively, a feed screw operatively engaging both the carrier and the rail, driving devices between the shaft and the screw, said devices including a clutch, and means automatically operated by one of the slides, to close the"clu'tc'hand operate the screw and advance the carrier and rail While the slides are in retracted position, said means including a lever connected to one of the clutch members, and an adjustable inclined block carried by one of the said slides and arranged to shift the lever at a predetermined point in the movement of the slide.

'21. In a metal working machine, the combination of a guide, a carrier slidable thereon, a tool holding slide on the carrier, a feed screw operatively connected to the carrier to move the same along the guide, a shaft, reversing gearing between the shaft and the slide, gearing between the shaft and the screw, said gearing including a normally open clutch, a lever fulcrumed on the carrier and connected to one of the clutch members to open or close the same, and an-adjustable inclined block mounted on the slide and arranged to strike and throw the lever to engage the clutch at a predetermined period during the movement of the slide.

22. In a metal working machine, the combination of a guide, atool carrier slidable thereon, a feed screw, a threaded sleeve r0 tatably mounted in the carrier and on the screw, means to prevent rotation of the sleeve, and means to rotate the screw.

23. In a metal working machine, the combination of a guide, a tool carrier slidable thereon, a feed screw, means to'rotate the screw when desired, a threaded sleeve on the screw and mounted for rotation in the carrier, means to prevent rotation of the sleeve I hination of a carrier, a tool holding slide mounted for movement thereon, a drive shaft, I'GVQISlllg gearing between the shaft and the slide,-to advance and retract the latter, said gearing including a clutch and a lever to shift the same, stops carried by the slide and arranged to strike and throw the lever in opposite directions, to reverse the motion said lever having a Wedge shaped projectlon, and a spring pin mounted on the carrier, over which said projection wipes as the lever passes the neutral point, said pin and projection acting to complete the throw of the lever.

25. In a metal working machine, the combination of a work holding table, a cross rail above the same, carriers adjustable on said .rail, tool holding slides mounted on the carriers'respectively, a sectional shaft extending along the rail, a clutch between the sections of the shaft, gearing between, each shaft section and one of the slides, and means to operate the shaft. h

26. In a metal working machine, the combination of a work holding table, guides be-;

vance the rail during the working operation of the machine, and driving devices including a clutch bet-ween the power shaft and said cross shaft, adapted to quickly returnthe rail, after a working operation.

ture in presence of two witnesses.

MORRIS SILBERMAN;

Witnesses: JOHN A. BOMMHARDT, WILLIAM SCHEIBEL.

In testimony whereof, I do afiix my signa- 

